如何使用CloudFormation创建Lambda函数的新版本？ [英] How to create a new version of a Lambda function using CloudFormation?

问题描述

我正在尝试使用CloudFormation创建Lambda函数的新版本。

I'm trying to create a new version of a Lambda function using CloudFormation.

我想拥有同一个Lambda函数的多个版本，以便我可以（ a）在不同版本（例如DEV和PROD）上指向别名，并且（b）能够回滚到早期版本

I want to have multiple versions of the same Lambda function so that I can (a) point aliases at different versions - like DEV and PROD - and (b) be able to roll back to an earlier version

这是我的Lambda版本的定义：

This is the definition of my Lambda version:

LambdaVersion:
  Type: AWS::Lambda::Version
  Properties:
    FunctionName:
      Ref: LambdaFunction

运行 aws cloudformation create-stack时会创建一个版本但是随后的 aws cloudformation update-stack命令不执行任何操作。没有创建新的Lambda版本。

A version gets created when running "aws cloudformation create-stack" but the subsequent "aws cloudformation update-stack" commands don't do anything. There are no new Lambda versions created.

我正在尝试将新的zip文件上传到S3，然后运行 update后，创建新版本的Lambda函数。 -堆。我可以用CloudFormation做到吗？ AWS :: Lambda ::版本是否真的损坏（如此处 https：// github .com / hashicorp / terraform / issues / 6067＃issuecomment-211708071 ）还是我只是没收到东西？

I'm trying to get a new version of the Lambda function created after I upload new zip file to S3 and then run "update-stack". Can I do it with CloudFormation? Is AWS::Lambda::Version really broken (as mentioned here https://github.com/hashicorp/terraform/issues/6067#issuecomment-211708071) or am I just not getting something?

更新1/11 / 17
来自Amazon支持的官方回复：
...要发布任何新版本，您需要定义一个附加的（sic） AWS :: Lambda ::版本资源...

Update 1/11/17 Official reply from Amazon support: "...for any new version to be published you need to define an addition (sic) AWS::Lambda::Version resource..."

AWS CloudFormation / Lambda团队，如果您正在阅读此书-这是不可接受的。修复它。

AWS CloudFormation/Lambda team, if you're reading this - this is unacceptable. Fix it.

推荐答案

AWS :: Lambda :: Version没什么用。您必须为每个Lambda版本添加一个新资源。如果您想为每个Cloudformation更新发布一个新版本，则必须破解该系统。

AWS::Lambda::Version is not useful. You have to add a new resource for every Lambda version. If you want to publish a new version for every Cloudformation update, you have to hack the system.

我解决了此问题，创建了Lambda支持的自定义资源，该资源每次触发部署。在此Lambda中，我将为参数中给出的Lambda函数创建新版本。

I solved this issue creating a Lambda backed custom resource which is triggered for every deployment. Inside this Lambda, I am creating a new version for the Lambda function given in parameter.

对于Lambda的源，您可以检查 http://serverless-arch-eu-west-1.s3.amazonaws.com/serverless.zip

For the Lambda's source you can check http://serverless-arch-eu-west-1.s3.amazonaws.com/serverless.zip

以下是使用此部署Lambda函数的Cloudformation示例（您可能需要进行一些修改）：

Here is the example Cloudformation using this Deployment Lambda function (You might need some modification):

{
  "AWSTemplateFormatVersion": "2010-09-09",
  "Parameters": {
    "DeploymentTime": {
      "Type": "String",
      "Description": "It is a timestamp value which shows the deployment time. Used to rotate sources."
    }
  },
  "Resources": {
    "LambdaFunctionToBeVersioned": {
      "Type": "AWS::Lambda::Function",
       ## HERE DEFINE YOUR LAMBDA AS USUAL ##
    },
    "DeploymentLambdaRole": {
      "Type": "AWS::IAM::Role",
      "Properties": {
        "AssumeRolePolicyDocument": {
          "Version": "2012-10-17",
          "Statement": [
            {
              "Effect": "Allow",
              "Principal": {
                "Service": [
                  "lambda.amazonaws.com"
                ]
              },
              "Action": [
                "sts:AssumeRole"
              ]
            }
          ]
        },
        "Path": "/",
        "ManagedPolicyArns": [
          "arn:aws:iam::aws:policy/service-role/AWSLambdaVPCAccessExecutionRole"
        ],
        "Policies": [
          {
            "PolicyName": "LambdaExecutionPolicy",
            "PolicyDocument": {
              "Version": "2012-10-17",
              "Statement": [
                {
                  "Effect": "Allow",
                  "Action": [
                    "lambda:PublishVersion"
                  ],
                  "Resource": [
                    "*"
                  ]
                }
              ]
            }
          }
        ]
      }
    },
    "DeploymentLambda": {
      "Type": "AWS::Lambda::Function",
      "Properties": {
        "Role": {
          "Fn::GetAtt": [
            "DeploymentLambdaRole",
            "Arn"
          ]
        },
        "Handler": "serverless.handler",
        "Runtime": "nodejs4.3",
        "Code": {
          "S3Bucket": {
            "Fn::Sub": "serverless-arch-${AWS::Region}"
          },
          "S3Key": "serverless.zip"
        }
      }
    },
    "LambdaVersion": {
      "Type": "Custom::LambdaVersion",
      "Properties": {
        "ServiceToken": {
          "Fn::GetAtt": [
            "DeploymentLambda",
            "Arn"
          ]
        },
        "FunctionName": {
          "Ref": "LambdaFunctionToBeVersioned"
        },
        "DeploymentTime": {
          "Ref": "DeploymentTime"
        }
      }
    }
  }
}

（免责声明：此代码是我的书的一部分，有关Lambda&您可以检查API网关： https://www.amazon.com / Building-Serverless-Architectures-Cagatay-Gurturk / dp / 1787129195 ）

(Disclaimer: This code is a part of my book, for more information about Lambda & API Gateway you can check: https://www.amazon.com/Building-Serverless-Architectures-Cagatay-Gurturk/dp/1787129195)

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